Graphical user interface for a portion of a display screen



The FIGURE is a front view of a graphical user interface for a portion of a display screen showing our new design.

The broken lines illustrate the display screen and the boundary surrounding the graphical user interface. The broken lines and the scale of the graphical user interface with respect to the display screen form no part of the claimed design.

The broken lines showing various regions and the areas there within are for the purpose of illustrating unclaimed portions and form no part of the claimed design. 

The ornamental design for a graphical user interface for a portion of a display screen, as shown and described. 